1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2d0018debf20397416eec88814ace75aacd39876ad20862b9260b51c17485d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fffcf83-d989-4ac0-bffc-5a93d6875c4c.json and https://artists.proofprofile.net/proofs/artist/8fffcf83-d989-4ac0-bffc-5a93d6875c4c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa9b066ecc6e6809e9bd260ab881f366d16f8eec0b3e5d0543ae2643c965738. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2402624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a867263967dc6281b5e69f5437bc957411ff1ae60b8ebb79ec61d140748275. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2402625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acc376096378bac32a67128119eba5cfc98f6473b8a1025d5960e58455afce1. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2402627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace3937810e2c42f4e84206a7593a1abe8fd654d4bacf03ea1b062612f5ad279. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2402628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f0818b41510c6995bd24d933544e18ab8392136e6c38e7dc8abc452d5264b6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2402630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae1b369ce5d99a307f81b5b027a710e233f87fdc58dd33b6fb67b3d9431d75a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2402631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1153e357b47537cf7cb44ef82441d0fc0a7c0b5a1ae8f068d40cce730f5f73a8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2401828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae612bf1224a877641e0c023ab4d489b5eb175ec0e9741c892075edb2b1b97c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2401829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326dce0dc81226d714e3f463d4f60e2e3c482ff538f6e134fe8e1405aea707d7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2401831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd188b0c2ceebef1b462e2a84f0e9fa60672bab37e87a3cfd1e8c4c027087e602. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2401832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92442f26ac5017a2a6be2ff738153ca95812de4b5451a8fd498d8b9c542ce8a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2401834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650b372562415ab5b983c42c0f44bf6e4fcde7a555f8d5cc580c2a3a5c207a7a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2401835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ba80814e762599c980925d7efad83cccc3927a7f70423000bdd8ce0582d73e. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e655c4b6dc134235f075b515e4b6014a85246a5ac0e3a331a5d00fefb77c02. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6c2c944966e431131ccb3c455a1105a3a8d3f0c2dd384d40909f46441b6db1. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2744b266ad6148093e3d3be77450a7f22c60de84d11e3901f91e3366cf9e4267. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5c6d460591120ac2d6f24f271db497da25e215a9eb574ccaede13c941a3d3e. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818a500d271fb200a1c4b6a2c4a87c0bbacb5ed41d7a75edd508363e6a02a765. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8291cc393bdfbf47f1f7f22a24c55e4089de1c6066d767ecfe29fe00024ede. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab03b9f657709d3ddcc14e97e6389ff3730e03f67e733e9d19fbc43f79b1e86. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd54afec82bc2d56294b7bae1feeafb89272764582058b6e4b4e52d136b45c35. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2400867.